Cohesion (n. lat. cohaerere "stick or stay together") or cohesive attraction or cohesive force is a physical property of a
substance, caused by the intermolecular attraction between like-molecules within a body or substance that acts to unite them.
Water, for example, is strongly cohesive as each molecule may make four hydrogen bonds to other water molecules in a
tetrahedral configuration. This results in a relatively strong Coulomb force between molecules. Van der Waals gases such as
methane, however, have weak cohesion due only to Van der Waals forces that operate by induced polarity in non-polar
molecules.

Cohesion, along with adhesion (attraction between unlike molecules), helps explain phenomena such as surface tension and
capillary action.

Source: WikepediA
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